<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/dayjs/1.11.7/dayjs.min.js"></script>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"
        integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <style>
        .red {
            color: red;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="container">
            <!-- 顶部搜索框模块 -->
            <div class="form-group">
                <div class="input-group">
                    <h4>品牌管理</h4>
                </div>
            </div>

            <!-- 数据表格 -->
            <table class="table table-bordered table-hover mt-2">
                <thead>
                    <tr>
                        <th>编号</th>
                        <th>资产名称</th>
                        <th>价格</th>
                        <th>创建时间</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <tbody v-if="list.length > 0">
                    <tr v-for="(item, index) in list" :key="item.id">
                        <td>{{item.id}}</td>
                        <td>{{item.name}}</td>

                        <!-- 如果价格超过100，就有red这个类 -->
                        <td :class="{red:item.price > 100}">{{item.price}}</td>
                        <td>{{dateFormate(item.time)}}</td>
                        <td><a @click.prevent="del(item.id)" href="#">删除</a></td>
                    </tr>
                    <tr style="background-color: #EEE">
                        <td>统计</td>
                        <td colspan="2">总价: {{ allPrice }}</td>
                        <td colspan="2">均价: {{ avgPrice }}</td>
                      </tr>
                </tbody>
                <tfoot v-else>
                    <tr>
                        <td colspan="5" style="text-align: center">暂无数据</td>
                    </tr>
                </tfoot>
            </table>

            <!-- 添加资产 -->
            <form class="form-inline">
                <div class="form-group">
                    <div class="input-group">
                        <input type="text" class="form-control" placeholder="资产名称" v-model.trim="assetName" />
                    </div>
                </div>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <div class="form-group">
                    <div class="input-group">
                        <input type="text" class="form-control" placeholder="价格" v-model.number="price" />
                    </div>
                </div>
                &nbsp;&nbsp;&nbsp;&nbsp;
                <!-- 阻止表单提交 -->
                <button class="btn btn-primary" @click.prevent="add">添加资产</button>
            </form>
        </div>
    </div>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                list: [
                    { id: 100, name: "外套", price: 199, time: new Date('2010-08-12') },
                    { id: 101, name: "裤子", price: 34, time: new Date('2013-09-01') },
                    { id: 102, name: "鞋", price: 25.4, time: new Date('2018-11-22') },
                    { id: 103, name: "头发", price: 19900, time: new Date('2020-12-12') }
                ],
                assetName:'',
                price:0
            },
            methods: {
                del(id) {
                    this.list = this.list.filter(item => item.id !== id)
                },
                add(){
                    // 判断
                    if (this.assetName == '') {
                        return alert('用户数据不能为空')
                    }
                    if (typeof this.price !== 'number') {
                        return alert('请输入正确价格')
                    }
                    //添加
                    let id = this.list.length > 0 ?
                    this.list[this.list.length-1].id+1 : 100
                    this.list.push({
                        id:id,
                        name:this.assetName,
                        price:this.price,
                        time:new Date()
                    })
                    // 清除表单
                    this.assetName = ''
                    this.price = ''
                },
                dateFormate(val){
                    return dayjs(val).format('YYYY-MM-DD')
                }
            },
            computed: {
                allPrice(){
                    return this.list.reduce((sum,item)=>sum+item.price,0)
                },
                avgPrice(){
                    return (this.allPrice/this.list.length).toFixed(2)
                }
            },
        })
    </script>
</body>

</html>